Printing press



March 6, 1928. 1,661,209

o. R. woLF PRINTING PRESS Filed June 12. 1922 l5 snees-sheet 1 PRINTING 'PRESS Filed June 12. 1922 v ssheets-sneet 2 March 6, 1928;

o. R. WOLF RINTING PRESS 5 Sheets-Sheet 4 bvmw i jzzMw/f/ Filed June 12. 1922 AMarch 6, 1928.

- o. R. woLF IJRINTING PRESS SSheets-Sheet 5 Filed June 12` 1922 Patented Mar. 6, 1928.

UNITED sfrA 'rEs OTTO RICHARD WOLF, OF RIVER FOREST, ILLINOS,

PANY, OF CHICAGO, VILIJINOIS,

7 Vram'rmo PRESS.

Application filed June 12,

My invention relates to driving mechanism land has for its principal object the provision of a device suitable'V for accurately and easily adjusting the 'speed of the registra- 6 tion rollers of printing presses 'whereby the web to be printed may be kept in proper registration with the printingcylinders, this being particularly desirableinthe printing of pictures in segments or colors'as is commonly done in newspaper printing. As will Vbe understood, thevrweb, in such printing, is acted upon by a plurality of printing cylinders successively, and it is necessary for accurate work that the printed portions of the web should be kept in exact registration with the printing portions of the cylinders. My invention provides mechanism,controllable by the operator whereby the speedof the web may be increased or decreased, within the limits necessary for this purpose, with reference to the surface speed of the printing cylinder. i

Other objects and advantages of the invention' will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawin s, discloses a preferred embodiment thereo a In the drawings: Figure 1 is a side view of a broken laway forward' portion of a press embodying'the invention. .j i

Figure 2 is a diagrammatical viewof a press embodying m invention, and disclosing' the course of tlie paper web.

Figure 8 is a Vertical longitudinal section' of a forward end portion of the press.v

`Figure 4 is a vertical tiransvcrse section, taken on line 4, 4, Figure 3." w i Figure 5 is a plan view taken from the position indicated by dotted .line 5, 5, Figure 3. i

section taken on leaving a supply-roll B and passing over Figure 6 is a 'horizontal section taken on partingfrom the spirit of Assrenonj 'ro THE 'rmnoim cont- A CORPORATION or ILLmoIs' 1922. Serial No. 567,624.

guide roll, slack or tightening roll 3, and i thcnce over guide rolls around a registration cylinder or roll 8, having a pressure roller. 9. .The Web then passes over a guide-roll 10V and to and between an impression cylinder 11 and a yrubber roller 12. The .web has only a small amount of contact on the impression cylinder 11 so .thatpthere is no drivingor drag action by onegupon the other. Thev web then passes over a guide roll13, a drying drums14, then to and'around a roll 15 so located as to 4, 5, 6 and 7, and

cause the web to remain in contact withV about 270 degrees Vofthe circu'mference of the drum, theA web A continuingv around guide-rolls 16,17 and 18 to land between a registration cylinder 19 and idle-roll 20, this arrangement being vsubstantially the same as roll 8 and cooperating elements. The vweb A then proceeds over guide-rolls v21 and:'10"

to and between an impression cylinder 11' I and rubber roll -12al of a second prlnting unit: 76

The courseof the web through the second and successive printing units is'the same as inthe first, just described, the corresponding parts of the successive units being designated by the same numerals together with exponent letter a for the second color printing unit and letter bV for the third color-unit, etc., depending Vupon the number of units used.

The invention, in the particular Vform of device chosen .to illustrate it, comprises means forv regulating andV controlling the speed of the Web ,A with respect to the-surface speed of the printing or impression cylinders, through" the medium of the registration cylinders 8, 19, 19a, etc., but it is to beunderstood that the invention is applicablefto regul ting the printing or impression cylinders, and hence the' surface speed Vof such cylinders with respect to the speed of the web, as may bev desired and Without dethe invention.

Each cylinder 11, 115 11b is driven from a main-drive shaft 67 by way of a suitable train of driving 'elements including a Vertical shaft 100 and 'gears 22 fastened to the shafts 100 and 67 as clearlyshown in Fig. 1 of the drawings. Each rubber 'roll 12 is actuated by and with its respective printing cylinder 11, 11' or 11, vand has'substantially the sameA surface speed ofv/the Vcylinder. ac-

j24 which meshes with a loosely lnounted upon a stationary stud 31- The shaft 57 has a tuating it. Each registration cylinder 8 0r 19 is rotatably mounted upon a transverse shaft 23. journaled in the supporting frame portion C of the press. Upon a projecting end of the shaft 23 is loosely carried a gear pinion 25 having 'a hub 26 loosely mounted upon a stud 27 secured to frame C, below the bearing of shaft 23. To the hub 26 is secured a sprocket wheel 28 connected by a link ('hain 29 to a sprocket wheel 30 having a hub 32 secured to a lower frame portion D. The hub 32 has a. bevel gear 33 engaging a like gear 34 fast to an end of a Worm shaft35 having bearings in the sides of a housing 36 and also having a worm 37 in mesh with a worm gear 38 mounted upon and keyed to a hub 39 of a ditferential gear 40 loosely mounted upon a transverse shaft 41. The housing 36 may be of any desired Shape to enclose the ditferential gearing hereinafter described.

The shaft 41 is journaled, near an end thereof, in an end of housing 36 and also in frame portion D, and has its opposite end 42 reduced and loosely journaled in an enlarged adjacent end of an alining shaft 43 journaled in the other end of said housing portion E. To the 36 and also in a frame inner end of shaft 43 is keyed a difl'erential gear 44 ditferentially connected to gear 40 by way of two gears 45, 45 loosely mounted upon trunnions 46, 46 projecting at right angles to the axes of shafts 41 and 43, and rom a cross block 47 securely keyed to shaft 41.

To the other end of shaft 41 is keyed a beveled gear 48 which meshes with a pinion 49 fast to the lower end of a Vertical shaft 50 suitably journaled at its lower and upper ends in suitable brackets 51 and 52 secured to frame portions D and O respectively. The upper' end of shaft 50 has keycd to it a bevel gear 53 which meshes With a bevel gear 54 secured to the registration cylinder 8, or 19, and to which it imparts motion.

The end of shaft 43 journaled in frame portion E, has keyed to it a gear 55 in mesh with a gear 56 keyed to a transvcrse shaft 57 journaled in frame portions D and E. gear 58 meshing with a gear 59 keyed to a transverse shaft 60 journaled in a frame portion F.

A'bevcl gear 61 is keyed to the end of shaft 60 and meshes With a beveled gear 62 keyed to the Vertical shaft 63 journaled in bearings 64, 64 secured to a portion G of the supporting frame of the press. lower end of shaft 63 has a beveled gear 65 keyed to it and in mcsh with a beveled gear 66 keyed to the drive shaft 67 of the press.

To the upper end portion of shaft 63 is keyed a. large gear 64' meshing with a pinion TllO, f

68 fastened on an end of a short longitudinal shaft 69 suitably journaled in bearing blocks carried by the supporting frame of the press. The shaft 69 has a gear 70 meshing with a` gear 71 keyed to an end of a longitudinal shaft 7 2 journaled in suitable bearing block's 73 carried by the supporting frame of the press, the shaft 72 extending longitudinally to the rear of the press, as elearly shown in Fig. 1 of the drawing. Each block 73 is supported and transversely movable upon a dove-tailed plate 74 which in turn is supported by a longitudinally adjustable dove-tailed tenon 75 carried by a bracket'76, the longitudinal adjustment of the plate 74 being made by ahand scrcw 77.

Attached to the shaft 72 so as to rotate therewith and to be adjustable longitudinally thereon is a friction pinion or drive disc 78 which engages with the adjacent face of a large disc 79 and, accordingly, as it is made to ap roachor recede from the'centcr of the disc 9, it Will increase or dccreaSe the speed of said disc.

The disc 79 is fast witha transverse shaft 80 journaled in the frame of the press `and the shaft has a gear`81 sec-ured to it, the gear 81 meshing with the gear 24 loosely mounted upon the shaft 23 and in mesh with the pinion 25.

It is to be understood that the mechanism above described for driving the roll 8 is duplicated for each one of the rolls 19 ahcad of each printing cylinder 11a, 11h, etc., a

duplication of the illustration of this mcch- 109 anism not being made upon the drawing for the purpose of convenience and clarity. Such mechanism will include, in each case, a

set of dilferential gears and a set of friction discs, the latter being shown in Fig. 1 of the drawing.

After the web of paper leaves the registration roller 8 it passes through the first color printing unit, consisting of the guide roller 10, etched or printing cylinder 11 and rub- U0 ber roller 12, guide roller 13, heating drum 14, guide rollers 15, 16, 17 and. 1.8, regist'ra-VV tion roller 19 and rollers 20 and 21. After i passing through this unit, the web proceeds to the second unit consisting of guide rollers U5 10B, etched or printing cylinder 11, rubber roller 12a, guide roller 13, heating drum 14, guide rollers v15, 16a, 17a and 18, registrartion roller 19a and rollers 20a`and 21a, and thence to the third unit. comprising guide roller 10h, etched or printing cylinder 11h, impressing roller 12h, guide roll 13, heating drum 14h, guide rolls 15b and 16h.

The web is then direeted back 'over the color printing units, and is printed in type on the opposite side` but, I lay no claim to i this operation, I desire, however, to call attention to the fact that before it is printed upon its opposite side, it is passed through ,the registration cylinder I and the web 13 thcreby kcpt'taut after it lcaves thelast colorv vprintingvunit. I i z It is to be understood that the iuve'ntion is not limitedl to printingipresses or thelilge,

;and hencethe,rll*8.,;l V T1 It 'will ?th'cref`ore be; apparent `that Vif'the but is also applicable to other devices or mechanisnis employing vdrivin means whereby it may be desired the rate lofdriye-of the devicesl oranechanisms, or the driv'esanion'g parts of adericc or mechanism. The invention also comprelhends other Vconstructions, details-anderrangements ofparts without departing from the spirit thereof.

In the operation .of thisparticular form `Vor embodiment oftheinvention, one of the objects is to control the speedaofthe .web by means of the registrationcylinders,and it will be notedthatthe contact of'Z the web with the printingi cylindcrsvplliy 119,111',` over only a small portion 'o'f the siu'faccof i the cylinders so that'the eylindersl haveno lso vice the drive is by way of 64' and 68, shaft 69, gears 70'and71; lsh'aft tendency to veffect a driving or retardation of the Webitself, the travel of the web being substantially fully under control oftheregistration cylinders.V

, At theside of the printing prcssgis'thel `main driving shaft 67 from which tl1eseveral mechanisms aredriven. rlhe printing rolls 11,113, 11h, in the illustrative vembodiment of the invention, are driven at Constant i or uniform speed .from said shaft 67 through o the meshed gears 22, shaft 100 and a suitable train of gears connected between shaft 100 and the etched or printing cylinders.

Each registration cylinder device is Ialso operated 'from the same main shaft--67, the registration cylinder devicer aheadi of the firstcylinder 11 being shown in Figxj'l'of the drawing and operated from sh'aft '(37 through the gears 66, 65eand shaft 63; From the latterthe drive is split,vso-to speak, and one side of the ditferential mechanismi is .operated from the shaft 63 by. Wayof the gears G2, 61, 59, 58, shaft 57, gears 50, 55. shaft V43 and `gear 44 of the differential device.

For the other side of theI ditl'erentialzde- 72, and frietional driver 7 8; in frictional contact with the friction disc 79. The drive continues from this disc through or byway of gears 81, 204 and 25, sprocket 28, Chain* 29, sprocket 30, gears 33` and 34, Wolni-'37,

'worm gear 38 and'differential gear 40.` .55

The proportions of thevarious trains'of gears and friction discs are Vso arranged that the shaft 43 Vmay operate atgreater speed than. or at the same speed of. orvat a lesser Aspeed than the shaft 41.` n the actual devices in operation `it Wasfound convenient to run 'the shaft 43 at about twice lthe speed of the shaft 41. Therefore, the gear 40 is operated at the Vproper speedl so that as ythe shaft 43 drives the i. lgear 44 the difi'erential idle gears 45 will have a certain amount of shaft 63, gears.

ridingouerthegear ;40 and'also atrarel, as

shaft-f4l; so: lthat :the'f.sha-ft141V drives through gears 48 and 49. shaft 50 gcars=53- and54,

gear 40 is causedV to travel'atVagreater'rate than 'or'- at' :a slowcr rate' :than 'the' fratc at ;speedwif thefshaft zan'dfhencc the roll 8 imove ;toward or v reccde from the 'center fof the large; disc-:79 Wherebythe drivmg speed of the disc-7 9'maybe increase'dsor decr'eased "accord1nlf1y. :s 'o i Assumingthat 'the prilited portionsof't'he web: should fbefioutf of` register? with the 'Web printing portiongo'fthe cylinder, Vand itis desired `tozeithervincrease 'o'r ``dccrease the speed of-"tlie'web with 'reference to the surface speed of the'cylinder,V the operator will` 'then ladJust the proper 'friction disc 'relation ;to-;effectssai'dresult. vThe oil'ect of the cylinder 8-, or the cylinder 19 inthe case Where the succeeding` registration 'cylinders are ad- 'justedyisvto hasten vor`retardV the lflow or travel of the -web' throughtl'ie press: IInasmuch as thefpaper is'already under a certain amount of tensionas it -travels throughthe press, the effect is' to produce either an added tension .or al subtracted'ftension onfthe paper `:softhat itwill havethe result of pas'smga littleifasterf or a 'little slowier through the printingiunm that is, between the cylinders V11 and 12,-01' :11al and 12a, or '11h' and 12.

The web has arsufiicient amount of elasticity toVV pernnt a forward gainer `rea'r'ward re- ;t'ardationin travel of the'web.` v''Inasmuch as v'the necessary adjustment is within but a Very small; fractionof; ani'nch, the lamount of necessaryadjustment will always b'e within .the limits of'increasul'or dee'reased stretch v`of the Vweb as'it is travelinz' through' the press. ,p i It'yvillbe apparent from the aboye'that one of the important objects of the invenvtionis thatthe 'web shall travel through the press atfa uniform rate 'of' speed; and where there ,is a slight mis-registration between the Vwebfand the `printing parts of the cylinders 'the' registration cylinders are inter- Vposedfin the means for causing the'travcl of theweb so'as to either has'tcn or retard the .trayel'of the Web slightly. so that it will return to its '-unifo'rin speed with respect to `the'surfaee'fof'the printing cylinders andin proper registration-thereu'ith,'the speed then being' mainta'ined uniform for a llong period of' time. djustmentof the speed is usually necessary lwhere there is a considerable change in` temperature of the working room or the temperature of the printing cylinder 'z al unit,:witl1'tlie block .47 fastened to 'the f and from various other causes'which has a tendency to cause a slight discrepaney in the' registration of the printed portions of the web and the corresponding printing portions of the cylinders.

While I have herein described, and upon the drawings, shown one illustrative embodiment of the invention, it is to be understood that the invention is not limited to the particular' construction, details' and arrangement of parts shown and described, but that other constructions, details and arrangements of parts, such as that for varying or adjusting the surface speed of the printing cylinder or like element With respect to the travel or speed of the Web, or varying or adjusting the speed of both the surface of the cylinder and the web, one With respect to the other, without departing from the spirit of the invention. Also, the invention is not limited to a multi-color press but is applicable to presses applying two or more impressions, or multi-impressions, whether all of the same color or of different colors.

lVliat I claim as new is:

1. In a printing press having printing units, a web feed device and a drive, .the combination of driving means for said device and driven by said drive, said means including differential driving elements, and continuously operated adjustable elements for varying the driving 'effect of one side of the (lifl'erential' driving elements.

2. In a printing press having printing units, a Web feed device and a drive, the comnbination of driving means for said device and driven by said drive, saidmeans including continuously operated differential driving elements, and continuously operated adjustable driving elements for changing the driving speed of the driving elements.

3. In a printing press having printing units, a web feed device and a drive, the combination of driving means for said device and driven by said drive, said means including variable driving elements, and constantly operated friction driving elements operatively connected to said v'ariable driving elements for controlling the driving effeet of said variable driving elements.

4. In a printing 'press havingprinting units, a web feed device and a drive, the combination of driving means for said device and driven by said drive, said means including constantly tions driven by said drive and each having differential elements, one of said sections having means for varying the driving effect of said diiferential elements.

5. In a printing press having printing units, a web feed device and a drive, the'combination of driving means for said deviceand driven by said drive, said means including driving sections driven by said drive and each having difl'erential elements, a final operated driving sec-i driving section driven by said elements and operatively connected to said devlce, and constantly operated means in one of said seci adjusting the driving mechanism Whereby the driving speed of' said device may be changed.

7 In a printingr press having printing units, a web feed device and a drive, the combination of driving means for said device and driven by said drive, said means including driving sections driven by said drive and each lhaving difi'erential elements, one of said Sections having friction driving members for controlling the driving effect of one of said elements, and means for adjusting the' relation of the friction driving members whereby the speed of the device may be adjusted.

8. In a. printing press having units, a web feed device and a combination of driving means for said device and driven by said drlve, said means including a difl'erential gearing, driving mechanism driven by said gearing and driving said device, and constantly operated means connected to said difl'erential gearing and having means for varying the driving effect of said gearing for correcting the feeding speed of said device. I

9. In a printing .press having printing units, a web feed device and a drive, the combination of driving means for said device and driven by said drive, said means including a differential gearing, an adjustable constantly operated friction drive effective to vary the driving effect of Vthe diferential gearlng.

10. In' a printing press having printing units, a web feed device, a main drive, and driving mechanism driven from the main drive and for each unit, the combination of a differential drive, said device having a registration roll for the Web, means driven by' the differential drive and driving said roll, a drive train operatively connected to one side of the diiferential drive and driven by the main drive, a. second drive train' constantly operatively connected to the pther side of the difl'erential drive and driven by the main drive, said second train having adjustable means for varying the driving effect of the difi'erential drive Whereby the speed of the iveb is corrected relative to the printrng units.

11. In a printing press, `a member having a traveling surface, a device for causinga travel of a Web, means for driving said membez' and said device, and means: including;v

ber having; a. traveling; sur-face,.l a: Webfeedz' device for moving the-web. for:receiv'i'ngzj an:- impression from saidi surface-,. means; 'for' driving Vsaid member 'i and. saifd dev'ce, any..

other driving meansconnectedI to: said'firstt ,driving means and-including adJust-able'fmo- `tion driving elements' wliereloyv`v the; speed? off' traYel of' said surface and; saidf webf'may. bez

made the same.

18. In a printing press comprislnggpmnt'" a printingV cylinder in eachv unit,. a; regifsl! tration roller" for the Web, 'av 'di'll'erential gearing operatedby: the drive. and; ope-ratifing the registration roller;v a'ndv adlustfablfevv i friction. means constantly operated' by; the: *drive andV controllingtlie speedof;j tl'iereg;w

fcrential gearing.

istration roller. c h

14. In aprinting press,` compri's1ngpmnt:- ing units, web'feeding means anda, drive, aprinting cylinder'- ineacli unit, afv registra i tionroller for-the-we1i,aa diferentia'll geariiig; operated by the driveand?operatingtlierregV istration roller, and? constantly' operated means including; relatively ladjustablef fricff tion membersfbr -regulating thev driving; speed of the vdiferential gearing` 15. In a multiirnpressio'n' printing press comprising afplurality of: printin units;7 web feeding' means and; a mainV ri'fve, aa printing cylinder in eachunit,a,.we11iregisV tratiqn roller for` each unit, dilferential gearng controlling the speed'` of'saidi regis'f tration rollers, and constantly. operatedi'. means includin'` an adjustable.` frictilon;vv member for regu atin,g,'''t1ie'speed.` of; said=difl 16. A multicolor printing. pressf compris' ing a paper supply ro1ler,.severalf` distinctiI` printing units each having anl et'clie'd. cylinder and an impressionV cyl1`nder;.registration cylinders, one in front of; thezfirst'.unitzand'` one between each pair of units;thereafter,7 differential gearing controlling' the; speed? of said registration cylinders, means?l incli1d-= ing friotion members.l for regulating the.``V speed of said diflerentialf gearing', and: al registration cylinder4 after the.: lastr printing: unit for keepin Vthe webv of papertaut;`

' 17. A multico or press comprisingf'severaldistinct color printing unitseach having' an. etched cylinder and a super V osedimpressi`on== cylinder, a. regi'strationv cy. inder, afN clifl'em` ential gearing deriving: motion from: the'V same source as said. etch'ed'- and. impressifon. cylinders and controllin lthe speedoffsaidl; registration cylinder, an meansf'operatedzli sald source and drivin oneside-ofsaiddi' ferential gearing at a different rate than the speed; of;V said: diifirentia'l; gearing; and; lieateaclizprintinguniti. y 193:.. multicolorrprintingf'pressficompmsf ing: azv paper' supply roll'erg. several; distinct printing-units `eacli=iliaving;v an i, et'chedlV cyl1n.-- der and: an; iinpression;cylinder,4 regis'tration ing. drumsa-f'on difyiiigjthe paper-.located after:

cylinders oneyin; front. of'i said? firstv unit: and??v one:` iietvveena` eeltqpafii'V of:V units-1:: tlieneaftem: dilferentiall.. gear'i'ng; controlling: the' speed of;

said? negi'stratio'n cylinder/82,", meansI including' frictionz. members: fon' regulat'ing; the speedi..

of? saidl` diiflieifential; gearing; and lieating-i drums; fondry'ingf; the: paper: lfocatedlA after each:printingaunit. i

20.; A.l mul'ticolonj printing: press' coinpri's-f" 111g: a.: paper supply' roll'ergi. several? distinct printing? unitsl each-having: am etclied cylin. der'v and: anV impressiom cylin'derr.regist'ration` y cylinders, one in front. of; thefii'st unit and .onev zlietweenV eachl Vpair' off linitstliereafteiy: i

dilferential gearing controlling: the speed ofi: saidregi'stration; cylind'ers, means; including frictn'onv roll'e'rsf for regulatingf the: speed? of! papen' taut, and; 'heatingf' drums:`` fon Jdnying the; paper. lbcat'ed. after' each! printing unit; i

adapted. to lie:v adj'usted'z in= engagement; With; i

th esame -zffro1n its Vcen'terftoitszcircumference, said: pi'iii'on:` derivi'nfi moti'on': from:l saidi se.c:- ond men'ti'oned' vertical. sha-ft',. and. mechani-A call'y; connected: toandi ac'tuating' said?` differentia'l eat, a registrationf= cylinder' actuat'ed. by' saif differential: gear.:

22; multicolorprintingv ress, com.- prismgz; a; friction: member, ai. fi-iction: rolll adapted` to; be; adjusted`l in.. engagementV withl thezsamefromzit's center: toflitscircnmference, diferential gearing; comprisin z; tfwo alining" independ'entf shafts capable Operating: ati different: speeds, a' gearsecuredito oneaofsaidl shafts', a.v gear' looselfyry rotatable: with: the: otherl of: sai'd'. sl1afts-,.al lil'oclz. fixedi to* said second sha'fti, t gears onz the: block: and meshed'. with saidL other gears, said? second? gear-being;

1110,1- said: dilferentialkgearin -,f a: mllen'iafter :the last: 'print-mg: unit: forfi` eeping;l` t-lieq weli' offV i operatively connected to said friction member and friction roll and said first gear being driven from the main driving4 source of the press, and a registration roll operatively connected-to said second gear. 23.l In a device of the class described having a printing roll a'nd means for causing a travel of the web to be printed by saidroll' at substantially the same speed as the surface speed of said roll, said means comprising a gear drive and constantly operated and adjustable friction means for varying the drive effect of said first .mentioned means for regulating the travel of the Web.

24. lIn a device of the class described having a printing roll and meansl for causing a travel of web to be printed by said roll at substantially the same speed as the surface speed of said roll, said means comprising a differential drive and a cof'ltinuously operating and adjustahle friction control drive co- Operating-with the differential drive for effeeting a Variation in the drivingl effect. of the differential drive.

25. In a drive of the class describedhaving a printing roll and a registration roll for feedingrthe web over 'the'printing roll for printing, driving means for said rolls, the driving means for'the registration roll having continuously Operating andadjustable friction drive members and means forregulating the driving speed of the roll for varying the speed of the web to obtain correct registration with the printing roll.

26. A. multi -impression printing press having a=plurality of'printing units to print different portions of'the complete design, and means to vary the speed of the web to each printing unit without stopping the travel of the Web, to insure accurate registering of the different portions of the deslgn being printed by the different printin units, said means comprising variable riving mechanism and variable friction driving means effective to vary the driving effect of the driving mechanism.

27. A multi -impression printing press having a plurality of printing units to print different portionsV of the complete design, and means to vary the speed. of the Web to the firstprinting unit and independently to the Iother printing units without stoppingl the travel' of the Web, to insure accurate registering of-the different portions of the design being printed by the different printing units, said means'comprising variable driving mechanism and variable friction driving means operative to adjust the driving operation of the driving mechanism.

Q8. A multi -impression printing press having a plurality of printing units to print different portions of the complete design, and means to independently vary the speed of the web to the first printing unit and to indcpendently adjust the speed of the web to the other printing units without stopping the travel of the web, toinsure accurate registering of the different portions of the design `being printed vby the different printing units, said means comprising variable drivlng mechanisn'r and variable friction driving means operative to adjust the driving operation of the driving mechanism. w

In witness whereof I have hereunto set my hand this 9th day of June, 1922.

' OTTO RICHARDVOLF. 

